Wizard King Thomas is a wizard king played by Thomas. He is also Merlin Martin's teacher.
He was accidentally transformed into a dragon when his attempt to perform a spell had gone horribly wrong. As a dragon and unable to control himself, he burned down Castle Tyvern and in the process, kidnapped Princess Jordan while her servants safely evacuated. He also burned down Castle Loray and kidnapped Prince Victor. He was then turned back to normal by the power of King Austin's sword. He acts as the false antagonist of the episode, King Austin and the Knights of the Round Table.